In the “How to Format” bar that shows when editing the body of a question or editing an answer, there is this example for how to format:
<http://foo.com> [foo](http://foo.com) <a href="http://foo.com">foo</a>
There is a problem with this: foo.com is a site that is owned by someone currently and has links to a bunch of ads. It could be sold to a malicious company and is linked in the Network's guidance. Also, it is a bad example in another way: it's not on HTTPS and thus not secure.
It should be replaced with https://example.com, which is a site that is set aside exclusively for being used as a random example website in cases like this.
There is also a related problem: in the help linked to in the formatting bar, there are examples that use insecure HTTP in the links, not HTTPS. Sites like https://google.com and https://yahoo.com support secure HTTPS, and the examples should show this; they should set an, ahem, example for using HTTPS in links if possible.